Slate Blue #6A5ACD
Slate Blue is a medium-dark, vivid purple with hex code #6A5ACD and RGB rgb(106, 90, 205).
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White text reads best on this color (5.30:1).
About this color
#6A5ACD is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.171 and its hue 286°. Its hue sits on the cool side of the wheel. It is the named color Slate Blue. White text reads best on it, at 5.30:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Slate Blue |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Colors that go with Slate Blue
Matches found by rotating Slate Blue around the OKLCH hue wheel, each labelled with the closest name in our list.
Complementary
The opposite hue (180°).
Analogous
Neighbouring hues, 30° either side.
Triadic
Three hues spaced 120° apart.
Color palettes with Slate Blue
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Slate Blue, closest first.
Similar named colors
The eight named colors closest to Slate Blue, with their ΔE distance.
- Light Indigo #6D5ACF ΔE 0.006
- Dark Periwinkle #665FD1 ΔE 0.013
- Iris #6258C4 ΔE 0.019
- Warm Blue #4B57DB ΔE 0.051
- Bluey Purple #6241C7 ΔE 0.058
- Purpley #8756E4 ΔE 0.059
- Royal Blue #4169E1 ΔE 0.064
- Medium Slate Blue #7B68EE ΔE 0.065
More about Slate Blue
How to make Slate Blue
A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.
- 2 parts purple
- 1 part blue
- 1 part white
Recipe result: #6D4FB4, a difference of ΔE 0.045 from Slate Blue. That is close; add a little more of one paint to match.
Codes for Slate Blue in every format
| HEX | #6A5ACD |
| RGB | rgb(106, 90, 205) |
| HSL | hsl(248, 53%, 58%) |
| OKLCH | oklch(54.4% 0.171 285.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #6A5ACD | 5.30:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #6A5ACD | 3.95:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #6A5ACD text on white | 5.30:1 | AA | Lc 76.1 | Fine for body text |
| #6A5ACD text on black | 3.95:1 | AA large text | Lc -25.7 | Dividers and decoration only |
Shades and tints of Slate Blue
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D6D6F5
oklch(88.6% 0.042 285.5)
-
Step 300
300
#BBBAF1
oklch(80.9% 0.077 285.4)
-
Step 400
400
#9A95EA
oklch(70.8% 0.123 285.5)
-
Step 500
500
#8378E3
oklch(63.2% 0.157 285.7)
-
Step 600
600 (this color)
#6A5ACD
oklch(54.4% 0.171 285.5)
-
Step 700
700
#5C4DB5
oklch(49.2% 0.158 285.6)
-
Step 800
800
#4B3F93
oklch(42.7% 0.133 285.8)
-
Step 900
900
#3E3775
oklch(37.8% 0.103 285.5)
-
Step 950
950
#242144
oklch(27.1% 0.064 285.2)
Slate Blue with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0E6FD1 | 0.091 |
| Deuteranopia (no green cones) | #0668CB | 0.091 |
| Tritanopia (no blue cones) | #48748B | 0.144 |
| Achromatopsia (no color) | #6B6B6B | 0.172 |
Use Slate Blue in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.